S&W frame confusion

I'm just getting back into shooting and collecting, and I'm looking into getting my first 357 (I know, I can't believe I never bought one before, either).

I haven't been paying enough attention of late and just wanting to get a bearing on the new (to me, anyway) numbers and frame designations. This is what I thought was the deal, from smallest to largest (I may be wrong, feel free to correct me):

J-frame - all the 5-shot 38's, simple enough (right?)
K-frame - the 10, the 65 and 66 (38 or 357, depending)
L-frame - only one I know by name is the 686 (38/357), maybe a few others I'm not aware of.
N-frame - 357 (the 27), 41mag, 44mag, maybe others

Now, 2 questions:

#1: I remember seeing this model 610/620 advertised as the 'replacement' to the 'tradition of the' either the K-frame or the 686, or the 65/66 specifically, I forget which exactly. Is the 610 or 620 (again, I get confused easily. My Dell laptops also are a 610 and a 620, go fig ), are these K-frames or L-frames? Or what?

#2: I bought a S&W 625 45ACP from a shipmate back in 2002. I haven't even looked at it in about 3 years and it's been in my storage unit for nearly as long. Which frame would that be? I'm guessing maybe it's an L-frame. It's large enough for 6 shots, but didn't seem oversized for my hand. Just curious if someone can confirm for me.

Again, I apologize if these seem like stupid questions, but I'm way rusty and just getting back into the scene. (I start my AT tomorrow, so I won't be checking the thread or replying for a few days)

#2: I bought a S&W 625 45ACP from a shipmate back in 2002. I haven't even looked at it in about 3 years and it's been in my storage unit for nearly as long. Which frame would that be? I'm guessing maybe it's an L-frame. It's large enough for 6 shots, but didn't seem oversized for my hand. Just curious if someone can confirm for me.

Thanks.

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If you want to get rid of that usless ole hunk of steel I would be more than happy to take it off your hands.

Seriously, if you ever want to part with that 625 please give me first shot at it. Oh, and welcome to the forum.

I did remember the designations for most models (barring the new(est) X-frame as the 500SW MAG is fairly new to me).

I was leaning toward a 66/65 or 686 before I tried re-educating myself and got confused looking through an online S&W catalog, where I found that the 66/65's are apparently no longer being made. I'm actually still leaning toward the 686. (Too bad most of those 3"/fixed sight "Transit Authority" models were destroyed (Thanks, Bill! ). That one would be just about ideal for my tastes.)

Dzscubie: As far as the 625, I don't have plans to get rid of it anytime soon, but I will keep you in mind, since you asked.